[LINCOLN CONSPIRATORS]. BRADY, Matthew, Photographer. Old Washington Arsenal Penitentiary. Oval view, captioned in manuscript, "'Old Capital Prison,' Washington, D.C. where the conspirators where [sic] confined and executed". 138 x 105 mm. According to Meredith (Mr. Lincoln's Camera Man/Matthew B. Brady), this image comprised photograph number 93 in Brady's slide lecture, although this example is printed in reverse. Mounted with a photograph of the Lincoln Monument and a photograph of a composite engraving of Lincoln's Cabinet.